4a and b "4) A solution of sugar in water is to be concentrated from 4% by weight to 20% byweight. The solution is fed continuously to a column through which air is bubbled. Air enters atthe bottom of column and exits at the top of the column. Entering air has a dry bulb temperature of45 °C and 10% RH. Exiting air is saturated at 100 % RH. The humidification of air is consideredadiabatic process.a) Make a sketch of the process and put all the information givenWhat are the humidities of entering and exiting air?b)c) Make a sugar balance and water balance to calculate how many kilograms of dry airmust be bubbled through column per kilogram of entering sugar solution.d) Mark the process on the psychrometric chart.

Hi and thanks for the question. Since you have asked to solve the subparts a and b, we are solving only the first 2 sub parts. If you need help with other sub parts, please post them separately. Given that, The weight% of sugar in the entering sugar solution = 4% The weight% of sugar in the exiting sugar solution = 20% Dry bulb temperature of entering air DB1 = 45oC Relative humidity of entering air RH1 = 10% Relative humidity of exiting air RH2 = 100% The humidification of air is considered adiabatic process b) Procedure to calculate the humidity of entering air: Draw a vertical line from the 45 oC dry bulb temperature (x-axis) until it intersects the relative humidity curve of 10% From the intersection point A, draw a horizontal line towards the humidity (y-axis) The point at which the horizontal line meets the humidity axis gives the humidity value of entering air stream. Follow the psychrometric chart given below for better understanding As per the psychrometric chart, The humidity of entering air is approximately = 0.006 kg/kg dry airProcedure to calculate the humidity of exiting air: For an adiabatic humidification process, draw a line parallel to the specific enthalpy curves from the intersection point A. Extend the line until it meets the relative humidity curve of 100% at intersection point B From the point B, draw a horizontal line towards the humidity (y-axis) The point at which the horizontal line meets the humidity axis gives the humidity value of exiting air stream. Follow the psychrometric chart given below for better understanding As per the psychrometric chart, The humidity of exiting air is approximately = 0.158 kg/kg dry air